(19)
(11) EP 2 090 420 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
04.06.2014 Bulletin 2014/23

(43) Date of publication A2:
19.08.2009 Bulletin 2009/34

(21) Application number: 09002052.0

(22) Date of filing: 13.02.2009
(51) International Patent Classification (IPC): 
B29D 11/00(2006.01)
 G02B 5/30(2006.01)
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK TR
Designated Extension States:
AL BA RS

(30) Priority: 14.02.2008 JP 2008033781

(71) Applicant: Zeon Corporation
Tokyo 100-8246 (JP)

(72) Inventors:
  • Hatano, Taku
    Tokyo 100-8246 (JP)
  • Arakawa, Kohei
    Tokyo 100-8246 (JP)
  • Yamanaka, Shunsuke
    Tokyo 100-8246 (JP)

(74) Representative: Albrecht, Thomas et al
Kraus & Weisert Patent- und Rechtsanwälte Thomas-Wimmer-Ring 15
80539 München
80539 München (DE)

   


(54) Method for producing retardation film


(57) A method for producing a retardation film comprising the steps of: co-extruding or simultaneously casting a thermoplastic resin A and a thermoplastic resin B to obtain a laminated film comprising a layer of the thermoplastic resin A and a layer of the thermoplastic resin B; and uniaxially stretching the laminated film at least twice to cross a molecular orientation axis in the layer of the thermoplastic resin A and a molecular orientation axis in the layer of the thermoplastic resin B each other at almost right angles.







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